
/************************************************************************************
 * Copyright (c) 2008 William Chen.                                                 *
 *                                                                                  *
 * All rights reserved. This program and the accompanying materials are made        *
 * available under the terms of the Eclipse Public License v1.0 which accompanies   *
 * this distribution, and is available at http://www.eclipse.org/legal/epl-v10.html *
 *                                                                                  *
 * Use is subject to the terms of Eclipse Public License v1.0.                      *
 *                                                                                  *
 * Contributors:                                                                    * 
 *     William Chen - initial API and implementation.                               *
 ************************************************************************************/

package org.dyno.visual.swing.parser.listener;

import java.beans.MethodDescriptor;
import java.lang.reflect.Method;

import org.eclipse.jdt.core.ICompilationUnit;
import org.eclipse.jdt.core.IJavaElement;
import org.eclipse.jdt.core.IMember;
import org.eclipse.jdt.core.IMethod;
import org.eclipse.jdt.core.IType;
import org.eclipse.jdt.core.JavaCore;
import org.eclipse.jdt.core.Signature;
import org.eclipse.jdt.core.dom.rewrite.ImportRewrite;
import org.eclipse.jdt.ui.JavaUI;
import org.eclipse.ui.IEditorPart;
import org.eclipse.ui.IFileEditorInput;

@SuppressWarnings("unchecked")
public class EventDelegation implements IEventMethod {

	private MethodDescriptor methodDesc;
	private String methodName;

	public EventDelegation(MethodDescriptor methodDesc, String methodName) {
		this.methodDesc = methodDesc;
		this.methodName = methodName;
	}

	@Override
	public String getDisplayName() {
		return methodName;
	}

	@Override
	public void editCode(IEditorPart editor) {
		Class<?>[] pd = methodDesc.getMethod().getParameterTypes();
		if (pd.length > 0) {
			String pname = pd[0].getName();
			int dot = pname.lastIndexOf('.');
			if (dot != -1)
				pname = pname.substring(dot + 1);
			
			String eventTypeSig = Signature.createTypeSignature(pname, false);
			
			IFileEditorInput file = (IFileEditorInput) editor.getEditorInput();
			ICompilationUnit unit = JavaCore.createCompilationUnitFrom(file.getFile());
			String name = file.getName();
			dot = name.lastIndexOf('.');
			if (dot != -1)
				name = name.substring(0, dot);
			IType type = unit.getType(name);
			
			IMember member = type.getMethod(methodName,
					new String[] { eventTypeSig });
			JavaUI.revealInEditor(editor, (IJavaElement) member);
		}
	}

	@Override
	public String createEventMethod(IType type, ImportRewrite imports) {
		Method mEvent = methodDesc.getMethod();
		Class[] pTypes = mEvent.getParameterTypes();
		String pcName = pTypes[0].getName();
		pcName = imports.addImport(pcName);
		String[] paras = new String[] { Signature.createTypeSignature(pcName,
				false) };
		IMethod eventMethod = type.getMethod(methodName, paras);
		if (!eventMethod.exists()) {
			StringBuilder builder = new StringBuilder(0);
			builder.append("private void ");
			builder.append(methodName + "(");
			builder.append(pcName);
			builder.append(" event");
			builder.append("){\n");
			builder.append("}\n");
			return builder.toString();
		}
		return null;
	}

	@Override
	public String createAddListenerCode() {
		return methodName + "(event);\n";
	}
}

